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| A study on structural instantaneous frequency identification based on an improved multi-synchrosqueezing generalized S-transform |
| YUAN Pingping1,2,3,CHENG Xueli4,WANG Hanghang3,SHEN Zhongxiang3,REN Weixin5,ZHANG Jian4 |
1.School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China;
2.Jiangsu New Yangzi Shipbuilding Ltd., Jingjiang 214532, China;
3.School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212100, China;
4.School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China;
5.College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518061, China |
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Abstract To improve the accuracy of structural instantaneous frequency identification, this paper proposed a new form of improved generalized S-transform（IGST）. The parameters selection method of window function in IGST was derived by concentration measure（CM）principle, and the improved multi-synchrosqueezing generalized S-transform（IMSSGST）was proposed combined with squeeze algorithm. The core idea of this algorithm is to perform multi-synchrosqueezing on the time-frequency distribution of IGST to the time-frequency ridge in a certain range. In terms of numerical simulation, the accuracy of the method was verified by using a time-varying structure of two-story shear frame. In the aspect of experiment, instantaneous frequency identification of a seven-story Reinforced Concrete（RC）shear wall structure was carried out, which verified the practicability of the method in practical engineering. Numerical simulation and experimental results show that this method can effectively improve energy aggregation of time-frequency analysis and accuracy of instantaneous frequency identification.
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Received: 03 February 2021
Published: 28 April 2022
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